**DP** is a **Linear Response TDDFT** code,
in **Frequency-Reciprocal** and **Frequency-Real** space, on a **Plane Waves** basis set.

- Definition: Linear Response Time-Dependent Density-Functional Theory (
**LR-TDDFT**) code
in Frequency Reciprocal (**k-ω**)
space on a Plane Waves (**PW**) basis set. Some quantities (the Kohn-Sham polarizability and the exchange correlation kernel) are calculated in Real (**r**) space
- Purpose:
**Dielectric ** and ** Optical Spectroscopy**
(Optical Absorption, Reflectivity,
Refraction Indices, EELS, IXSS, CIXS, ...).
- Systems: Bulk Solids, Surfaces, Clusters, Molecules, Atoms
(through supercells) made of Insulator, Semiconductor
and Metal elements.
- Approximations:
**RPA**,** ALDA**,** GW-RPA**, **LRC**,
non-local kernels, ...,
with and without **LF** (Local Fields).